Drawing-board attachment.



W. N. SPITLBR. DRAWING BOARD ATTACHMENT.

APPLIGATION FILED DEC. 24. 1913.

Patented Feb.23, 1915.

w 0.0 7 TI... 2 J 1 Z 1 Z 1 WESLEY N. SPITLER, OF CHICAGO, ILLINOIS.

DRAWING-BOARD ATTACHMENT.

Application filed December 24, 1913.

To all whom it may concern:

Be it known that I, WESLEY N. SPITLER, citizen of the United States of America, residing at 450 North Monticello avenue, Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Drawing-Board Attachments, of which the following is aspecification.

This invention relates to drawing board attachments and it consists in the novel features hereinafter described and claimed.

An object of the invention is to provide an attachment of simple structure adapted to be applied to the edge of the drawing board and which serves to keep the edge of the board justified in order to provide an accurate guide for the T-square used upon the board.

The attachment is made of metal or' other hard material and its shape is such that it may contract and expand incident to changes in temperature without having its edge portion moved out of proper relation with respect to the board.

In the accompanying drawing :Figure 1 is a plan view of a board with the attachment applied. Fig. 2 is a sectional view of the device cut on the line 22 of Fig. 1. Fig. 3 is a perspective view of the attachment detached from the board.

The attachment comprises a rigid ruling strip of metal or other hard material, 1 having angularly disposed side portions 2which are adapted to be positioned with relation to the cord so that their long dimensions are approximately parallel with the adjacent edge of the board. The strip 1 is provided at its ends with portions 3 and 4 which are slotted as at 5 and adapted to receive screws 6 or other securing devices whereby the attachment is connected with the board. The strip 1 has its sides 2 integral and said strip is L-shaped in cross-section, as shown. The portions 3 and 4 are also integral with the strip 1.

It is apparent that by loosening the screws 6 the strip 1 may be adjusted with relation to the board in order to position the outermost side portion 2 in true parallel relation to the edge of the board. The end portion 4 is provided with an outwardly bowed section 7 which is so disposed that Specification of Letters Patent.

Patented Feb. 23, 1915.

Serial No. 808,552.

the intermediate portion of the strip 1 may contract or expand incident to the changes of temperature and the said section 7 will give to permit of such contraction or expansion without buckling the outer portion of the strip 1 or causing the side portions 2 thereof to become displaced with relation to its adjustment with respect to the board.

One of the side portions 2 is provided upon its outer surface with a series of graduations 8 which may be used as guide lines for the T-square as the head of the square is moved along the outer surface of the strip. These graduations may be inches or fractions thereof or they may represent the different units of any other system of measuring. The inner edge of that portion 2 which is approximatelv in the same plane as the surface of the board is spaced from the edge of the board and consequently a large piece of paper may extend through the space.

Having described the invention what is claimed is 1. A relatively rigid ruling strip having a substantial length and provided at its opposite ends with laterally and inwardly extending longitudinally slotted arms integral therewith, one arm being resilient and curved longitudinally outwardly to permit of the longitudinal expansion and contraction of said strip without causing the same to move laterally perceptibly, and clamping screws arranged within the slots and engaging a drawing board to laterally adjustably secure the ruling strip to the drawing board.

2. A relatively rigid ruling strip having its opposite ends provided with laterally and inwardly extending arms, one arm being resilient and curved longitudinally outwardly to permit of the longitudinal expansion and contraction of the rulingstrip without causing the same to move laterally perceptibly, and means to attach said arms to a drawing board.

In testimony whereof I affix my signature in presence of two witnesses.

WESLEY N. SPITLER.

Witnesses:

JOHN F. VOIGT, RAYMOND J. DARBY.

Gopiea of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

Washington, D. 0. 

